TM  5-3805-261-24P C o d e Application/Explanation PA PB PC** PD PE PF PG KD KF KB Stocked Items; use the applicable NSN to request/requlsition items with these source codes.  They  are  authorized  to  the  category indicated  by  the  code  entered  In  the  3d position  of  the  SMR  code. *    Items    coded    PC    are    subject    to deterioration. Items   with   these   codes   are   not   to   be requested/requisitioned   individually.   They are part of a kit which is authorized to the maintenance  category  Indicated  in  the  3d position  of  the  SMR  code.  The  complete  kit must  be  requisitioned  and  applied. MO-(Made  at  UM/ AVUM  Level) MF-(Made  at  DS/ AVUM  Level) MH-(Made  at  GS Level) ML-(Made  at  Spe- cialized   Repair Activity (SRA)) MD-(Made   at Depot) AO-(Assembled   by UM/ AVUM Level) AF-(Assembled   by DS/AVIM Level) AH-(Assembled   by GS   Category) AL-(Assembled   by SRA) AD-(Assembled   by Depot) Items with these codes are not to be requested/requisitioned Individually. They must be made from   bulk   material   which   is identified by the part number in the  DESCRlPTlON  AND  USABLE ON CODE (UOC) column and listed  In  the  Bulk  Material  group of   the   repair   parts   list   in   this RPSTL.  If  the  item  is  authorized to you by the 3d position code of the  SMR  code,  but  the  source code  indicates  it  Is  made  at  a higher level, order the Item from the  higher  level  of  maintenance. Items with these codes are not to be requested/requisitioned individually. The parts that make up  the  assembled  item  must  be requisitioned  or  fabricated  and assembled   at   the   level   of maintenance  Indicted  by  the source code. If the 3d position code of the SMR code authorizes  you  to  replace  the Item,   but   the   source   code indicates  the  item  is  assembled at a higher level, order the Item from the higher level of maintenance. XA- Do not requisition an "XA"-coded Item. Order its next higher assembly. (Also refer to me NOTE  following.) XB- lf an ‘XB” Item is not available from salvage, order it using the CAGE and part number given. XC- Installation   drawing,   diagram,   instruction sheet, field service drawing, that Is identified by  the  manufacturer’s  part  number XD- Item Is not stocked. Order an ‘XD”-coded Item  through  normal  supply  channels  using the CAGE and pan number given, If no NSN Is  available. NOTE: Cannibalization or controlled exchange, when authorized, may be used as a source of supply for items with the above source codes, except for those source coded  “XA”  or  those  aircraft  support  items  restricted  by requirements of AR 700-42. (2) Maintenance  Code.  Maintenance  codes  tell you  the  level(s)  of  maintenance  authorized  to  USE  and REPAIR support items. The maintenance codes are en- tered  in  the  third  and  fourth  positions  of  the  SMR  code  as follows: (a)  me  maintenance  code  entered  In  the third position tells you the lowest maintenance level authorized to remove, replace, and use an item. The maintenance code entered in the third position will lndi- cate  authorization  to  one  of  the  following  levels  of maintenance. Code Application/Explanation C - Crew  or  operator  maintenance  done  within unit  maintenance  or  aviation  unit  mainte- nance. O - Unit maintenance or aviation unit category can remove, replace, and use the Item. F - Direct  support  or  aviation  intermediate  level can  remove,  replace,  and  use  the  item. H - General  support  level  can  remove,  replace, and use the item. L - Specialized repair activity can remove, re- place,  and  use  the  Item. D - Depot level can remove, replace, and use the item. (b) The maintenance code entered in the fourth position tells whether or not the item is to be re- paired  and  Identifies  the  lowest  maintenance  level  with the capability to do complete repair (i.e., perform all authorized   repair   functions).   (NOTE:   Some   limited   repair may  be  done  on  the  item  at  a  lower  level  of  maintenance, If  authorized  by  the  Maintenance  Allocation  Chart  (MAC) and SMR codes.) This position will contain one of thefol- lowing   maintenance   codes: Code Application/Explanation O - Unit maintenance or aviation unit Is me low- est  level  mat  can  do  complete  repair  of  the Item. F - Direct support or aviation Intermediate is the lowest  level  than  can  do  complete  repair  of me item. 2